TY  - JOUR
AU  - Leutola, K.
AU  - Nieminen, J.
TI  - Relations, coverings, hypergraphs and matroids
JO  - Czechoslovak Mathematical Journal
PY  - 1983
SP  - 509
EP  - 518
VL  - 33
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1983.101906/
DO  - 10.21136/CMJ.1983.101906
LA  - en
ID  - 10_21136_CMJ_1983_101906
ER  -